Public bug reported:
I removed LightDM on the 14th and then didn't reboot until after
upgrading to Focal. The next reboot didn't launch a display manager at
all, and we tracked this down to /etc/systemd/system/display-
manager.service still pointing to lightdm.service. This is probably a
bug in lightdm {pre,post}rm?
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: lightdm (not installed)
ProcVersionSignature: Ubuntu 5.3.0+bcachefs.git20200106.d763e8ab-1-generic
5.3.13
Uname: Linux 5.3.0+bcachefs.git20200106.d763e8ab-1-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu15
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Jan 24 11:18:25 2020
InstallationDate: Installed on 2019-08-29 (148 days ago)
InstallationMedia: Ubuntu 19.10 bcachefs (20190828)
SourcePackage: lightdm
UpgradeStatus: Upgraded to focal on 2020-01-20 (3 days ago)
** Affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal wayland-session
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https://bugs.launchpad.net/bugs/1860770
Title:
GDM fails to start at boot after removing LightDM
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